Chelsea now are like most of Mourinho's teams, they're mercenaries. None of them apart from Terry now actually has much affection for the club, a fair few will look to jump ship. I think Mourinho used to know how far he could push a team without having them implode, but the second half of last season he pretty much played the same XI six months straight just to win the title. And his behaviour in the press isn't really conducive to getting players in your corner, along with the genuine appearance of a bit of a revolt in the dressing room from some players.
I think Ancelotti would actually be the perfect manager to drag them out of this. Players from all his previous clubs seem incredibly fond of him as a manager and a person, and Chelsea actually have a squad capable of winning the league, their mental game just isn't there. Ancelotti comes across as a guy that'll settle things down a bit and make the egos feel loved again. Mourinho just does more damage each time he does a conference after a poor result, he's had the first half of the season to "turn it around" and the turning hasn't started.